You can also take advantage of "Owner's Comments" and let others know your opinion about the Zestimate. You can include details about the property you think should highlight its features so others can see a fuller picture of the home and substantiate what you believe should be its value. In the coming months, we plan to bring back online our "Owner's Estimate" tool. This tool allows owners to create their own estimate by including other details of the home that were not factored in the Zestimate. The tool went offline due to improvements we are making.

Bottomline, Zestimate is only a guide, a starting point when researching home values. If you want a more accurate estimate of the home, you can request from your local realtor to provide you a CMA.

There is information on the Zestimate here that might be useful. The range of accuracy is different for different areas depending on the information available to Zillow. There is an accuracy chart for different areas here. Hope it helps.